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Origins of the Solar System
Guided Notes
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Solar Nebula Hypothesis -- video-http://www.youtube.com/watch?v=PL3YNQK960Y
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Questions from the video…
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How long ago did our solar system begin to form?
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What were the two main gasses in the cloud that formed our solar system?
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______________________________________
What is it called when dust and rocks stick together due to mutual gravity?
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_____________________________________
The birth of the sun was marked by the beginning of what process?
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______________________________________
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Because of the cooler conditions and abundance of ice and gas, the materials in the
outer regions of the solar system formed what type of planets?
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______________________________________
Origins of the Solar System
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The Solar Nebula Hypothesis:
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Planets form at the same time and from the same cloud of dust as a ____________
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These nebula are often referred to as “stellar nurseries”
Step 1- Protostellar Nebula
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A large cloud of gas a dust began to ____________________ and ___________
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Mostly H and He
Step 2- Sun’s Formation
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As the protostellar nebula contracted, it formed a flat __________ with a bulge at its
center
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As the pressure and heat grew, it triggered nuclear _______________, and the sun was
born.
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Step 3- Planet Formation
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Planets began to form from the remaining protostellar materials through
_________________________ (smashing together) and
__________________________ (solidifying of gas and ice particles)
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Inner planets and outer planets formed in slightly different ways due to their distances
from the sun and the available ______________________ in those areas
Step 4- Clearing the Nebula
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Remains of the protostellar ________________ were cleared away by:
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Solar wind
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Sweeping-up of space debris by planets
This was a time of heavy bombardment by asteroids and ____________________
Planet formation in other systems
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Many young stars in the Orion Nebula are surrounded by dust disks:
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Probably sites of __________________ ___________________________ right now!
New discoveries in planet formation
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Video highlighting recent discovery made by the ALMA Radio telescope in Chile